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/* @(#)PBMImageReaderSpi.java
 * Copyright © 2012 Werner Randelshofer, Switzerland.
 * You may only use this software in accordance with the license terms.
 */
package ru.sbtqa.monte.media.pbm;

import java.io.IOException;
import java.util.Locale;
import javax.imageio.ImageReader;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import static ru.sbtqa.monte.media.iff.IFFParser.stringToID;

/**
 * ImageIO service provider interface for images in the Amiga IFF Interleaved
 * Bitmap image format (ILBM).
 *
 * @author Werner Randelshofer
 * @version $Id: PBMImageReaderSpi.java 364 2016-11-09 19:54:25Z werner $
 */
public class PBMImageReaderSpi extends ImageReaderSpi {

    protected final static int FORM_ID = stringToID("FORM");
    protected final static int CAT_ID = stringToID("CAT ");
    protected final static int LIST_ID = stringToID("LIST");
    protected final static int PBM_ID = stringToID("PBM ");

    public PBMImageReaderSpi() {
        super("Werner Randelshofer",//vendor name
              "1.0",//version
              new String[]{"PBM"},//names
              new String[]{"pbm", "PBM", "lbm", "LBM"},//suffixes,
              new String[]{"image/pbm"},// MIMETypes,
              "ru.sbtqa.monte.media.pbm.PBMImageReader",// readerClassName,
              new Class[]{ImageInputStream.class},// inputTypes,
              null,// writerSpiNames,
              false,// supportsStandardStreamMetadataFormat,
              null,// nativeStreamMetadataFormatName,
              null,// nativeStreamMetadataFormatClassName,
              null,// extraStreamMetadataFormatNames,
              null,// extraStreamMetadataFormatClassNames,
              false,// supportsStandardImageMetadataFormat,
              null,// nativeImageMetadataFormatName,
              null,// nativeImageMetadataFormatClassName,
              null,// extraImageMetadataFormatNames,
              null// extraImageMetadataFormatClassNames
        );
    }

    @Override
    public boolean canDecodeInput(Object source) throws IOException {
        if (source instanceof ImageInputStream) {
            ImageInputStream in = (ImageInputStream) source;
            in.mark();

            // Check if file starts with "FORM", "CAT " or "LIST"
            int fileID = in.readInt();
            if (fileID != FORM_ID && fileID != CAT_ID && fileID != LIST_ID) {
                in.reset();
                return false;
            }
            // Check if file content is "ILBM" or "ANIM"
            int contentSize = in.readInt();
            int contentID = in.readInt();
            if (contentID != PBM_ID) {
                in.reset();
                return false;
            }
            in.reset();
            return true;
        }
        return false;
    }

    @Override
    public ImageReader createReaderInstance(Object extension) throws IOException {
        return new PBMImageReader(this);
    }

    @Override
    public String getDescription(Locale locale) {
        return "PBM Packed Bitmap";
    }
}